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DocID024597 Rev 3 749/1693

RM0351 Advanced encryption standard hardware accelerator (AES)

751

25.14.17 AES Suspend registers (AES_SUSPxR) (x = 0..7)

Address offset: 0x040 (AES_SUSP0R) to 0x05C (AES_SUSP7R)

Reset value: 0x0000 0000

These registers contain the complete internal register states of the AES processor when the

GCM/GMAC is selected, and are useful when a suspend has to be done because a high-

priority task has to use the AES processor while it is already in use by another task.

When such an event occurs, the AES_SUSP0..7R registers (when GCM/GMAC is selected)

have to be read and the read values have to be saved somewhere in the memory space.

Then the AES processor can be used by the preemptive task, and when AES computation is

finished, the saved context can be read from memory and written back into their

corresponding suspend registers.

Note: 1 These registers are used only when GCM/GMAC algorithm mode is selected.

2 These registers can only be read when AES is enabled (Bit [0] set to 1 in AES_CR register), else

reading these registers while AES is disabled will return the value 0x00000000.

25.14.18 AES register map

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

AES_SUSPxR

rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

1514131211109876543210

AES_SUSPxR

rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

Table 145. AES register map

Offset Register

0x0000

AES_CR

Res.

KEYSIZE

Res.

CHMOD[2]

Res.

GCMPH[1:0]

DMAOUTEN

DMAINEN

ERRIE

CCFIE

ERRC

CCFC

CHMOD[1:0]

MODE[1:0]

DATATYPE[1:0]

Reset value 0 0 000000000000000

0x0004

AES_SR

Res.

BUSY

WRERR

RDERR

CCF

Reset value 0000

0x0008

AES_DINR AES_DINR[31:0]

Reset value 00000000000000000000000000000000

0x000C

AES_DOUTR AES_DOUTR[31:0]

Reset value 00000000000000000000000000000000

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English

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